50 ft 3/8″ × 5/8″ Line Set for Mini Split – Pre-Insulated HVAC Copper Refrigerant Tubing

50 ft 3/8" x 5/8" Line Set for Mini Split HVAC

The 50 ft 3/8" x 5/8" line set for mini split HVAC systems is a pre-insulated copper refrigerant tubing set designed for ductless mini split air conditioners, heat pumps and split system installations.

This HVAC copper line set includes a 3/8" liquid line and a 5/8" suction line with factory-applied insulation. It supports efficient refrigerant transfer, helps reduce condensation and improves installation consistency for residential and light commercial HVAC projects.

Dabund supplies mini split line sets for HVAC installers, contractors, wholesalers and distributors in the US and international markets, with OEM, ODM and bulk supply options available.

What This 50 ft Mini Split Line Set Includes

This complete HVAC line set package is designed to simplify mini split installation by combining pre-insulated copper tubing and essential connection components in one product.

• Pre-insulated copper refrigerant tubing: 3/8" liquid line and 5/8" suction line.

• Pre-flared connections and flare nuts for faster installation.

• Durable insulation to help minimize energy loss and surface condensation.

• Protective caps, cover and packaging for secure shipment.

• Suitable for residential, commercial, replacement and retrofit HVAC jobs.

Product Overview: Pre-Insulated HVAC Copper Refrigerant Tubing

This 50 ft pre-insulated copper tubing line set provides a continuous refrigerant line run between indoor and outdoor HVAC units. Factory-applied insulation helps maintain stable refrigerant temperature, reduce heat gain and heat loss, and control condensation on the tubing surface.

The 3/8" line is commonly used as the liquid line, while the 5/8" line is commonly used as the suction line. This size pairing is widely used in larger mini split and ductless HVAC systems, depending on the equipment manufacturer’s requirements.

Technical Specifications

Key Features of 50 ft 3/8" x 5/8" Mini Split Line Set

• 50 ft pre-insulated HVAC copper refrigerant tubing for longer mini split runs.

• 3/8" liquid line and 5/8" suction line for compatible ductless systems.

• 99.9% pure copper construction supports reliable refrigerant flow.

• Factory insulation helps reduce thermal loss and condensation.

• Pre-flared ends and included flare nuts help reduce field preparation work.

• Suitable for mini split air conditioners, heat pumps and light commercial HVAC projects.

• UV and moisture-resistant insulation options are available.

• Available in multiple insulation thicknesses for different installation environments.

• Supports replacement, retrofit and new HVAC installation jobs.

• OEM branding and customized packaging are available for distributors.

Premium Copper Refrigerant Tubing

99.9% Pure Copper

The tubing is made from 99.9% pure copper, delivering strong thermal conductivity, good corrosion resistance and reliable mechanical performance for HVAC refrigerant line applications.

Pre-Flared Ends with Flare Nuts

Pre-flared ends and standard flare nuts help speed up installation, reduce on-site preparation and support a cleaner connection process for HVAC technicians.

50 ft Length for Moderate to Long Runs

The 50 ft length is suitable for many indoor-to-outdoor unit distances where shorter line sets are not enough. Final line length and elevation limits should always follow the mini split manufacturer’s installation manual.

High-Density Insulation for HVAC Performance

The high-density insulation helps control condensation, reduce energy loss and protect the copper refrigerant tubing from normal indoor and outdoor installation conditions.

• Helps maintain consistent refrigerant temperature throughout the line run.

• Reduces heat gain and heat loss during cooling and heating cycles.

• Minimizes surface condensation and pipe sweating.

• Supports outdoor use with UV and moisture-resistant insulation options.

• Available in multiple insulation thicknesses for different project requirements.

Key Benefits of This Mini Split Line Set

Ideal for Mini Split and Heat Pump Systems

This 3/8" x 5/8" mini split line set is compatible with many ductless mini split and heat pump systems in residential and commercial buildings. It is commonly used by HVAC technicians for reliable refrigerant piping and easy installation.

Faster Installation and Improved Efficiency

Factory-applied insulation, pre-flared ends and included flare nuts help save jobsite time, reduce labor cost and improve installation consistency across multiple projects.

Enhanced System Durability

High-quality copper and durable insulation help protect the line set from environmental stress, moisture and thermal loss, supporting long-term HVAC system performance.

99.9% Pure Copper

White PE Insulated Pipe

Plastic Cap Protection

Features of Pipe Insulation Tubing

The pipe insulation tubing is designed to support stable refrigerant temperature, reduce surface condensation and protect copper tubing during indoor and outdoor HVAC installations.

Thermal Insulation Pipe Production

Insulation Pipe Warehouse

Inner Layer Insulated Pipe

Applications: Where to Use This Line Set

This 3/8" x 5/8" mini split line set is suitable for moderate line runs in HVAC installation, replacement and retrofit projects.

• Residential ductless AC units.

• Multi-zone mini split systems.

• Heat pump installations.

• Light commercial HVAC projects.

• Replacement and retrofit jobs.

• VRF, unitary and compatible ductless systems when specified by the equipment manufacturer.

Installation Tips for Best Performance

Measure Required Length Before Installation

Measure the full distance between the indoor and outdoor units before installation. Confirm that the 50 ft line set is within the equipment manufacturer’s approved line length.

Check Insulation Continuity

Make sure the insulation remains continuous along the line run, especially near wall penetrations, bends and connection points. This helps reduce energy loss and condensation.

Torque Flare Nuts Correctly

Use the correct torque value specified by the HVAC equipment manufacturer to reduce the risk of refrigerant leaks at flare connections.

Protect Outdoor Runs

For extended outdoor exposure, use a compatible line set cover or protective conduit to improve UV, weather and mechanical protection.

Mini Split Line Set Size Options

Recommended Applications by AC Capacity

Why Choose Dabund 50 ft 3/8" x 5/8" Line Set?

Manufacturing Experience Since 2008

Dabund is a manufacturer of mini split line sets, insulated copper pipe, aluminum pipe and HVAC parts. The company supports global HVAC customers with production experience, export service and stable shipment capability.

Individual Pre-Insulated Rolls

Individual pre-insulated rolls are designed to fit ductless mini split, VRF, heat pump and unitary system installations, helping contractors select suitable line set products for different project requirements.

Competitive B2B Supply

Dabund provides quality HVAC products with competitive pricing, professional service, OEM customization and private-label support for wholesalers, distributors and brands.

Dabund Factory

Dabund produces insulated copper pipe, mini split line set, aluminum pipe and HVAC parts for global customers.

SGS Certificate

Mini split line set insulation can be made with polypropylene or black rubber with UV resistance, meeting ASTM E84, UL94, ASTM D1056 and ASTM G21 requirements.

Exhibition

Dabund joins HVAC exhibitions worldwide to help customers experience mini split line set products face to face.

FAQ

What is a 50 ft 3/8" x 5/8" line set used for?

It is used to connect indoor and outdoor units in mini split air conditioners, ductless HVAC systems and heat pumps that require a 3/8" liquid line and 5/8" suction line.

What AC capacity is 3/8" x 5/8" commonly used for?

The 3/8" x 5/8" line set is commonly used for 3.0 ton to 4.0 ton ductless mini split systems, including many 36,000 BTU to 48,000 BTU applications. Always verify the equipment manual.

Can this line set be used with all mini split brands?

It is compatible with many mini split and ductless AC brands in the US and international markets, but installers should always verify required line size, length and refrigerant specifications before installation.

Can I cut this line set to a custom length?

Yes. The copper tubing can be trimmed to the required length, but proper cutting, deburring, flaring, torque and sealing practices must be followed to avoid leaks.

Is this line set suitable for outdoor exposed installation?

The insulation has moisture and UV-resistant options. For extended outdoor exposure, a protective conduit or line set cover is recommended for better long-term protection.

Is the tubing pre-insulated?

Yes. The copper tubing comes with factory-applied insulation to reduce heat transfer, control condensation and save installation time.

Does it include flare nuts?

Yes. This line set can include pre-flared connections and standard flare nuts for easier HVAC installation.

Can this line set be used with R410A and R32 refrigerants?

Yes. It can be used with common HVAC refrigerants such as R410A and R32 when installed according to system specifications and local code requirements.

Can Dabund provide other sizes and lengths?

Yes. Dabund can supply multiple line set sizes and lengths, including 15 m, 20 m, 25 m, 30 m and 50 m, with different insulation thickness options.

Are you a trading company or manufacturer?

Dabund is a manufacturer of mini split line sets, insulated copper pipe, aluminum pipe and HVAC parts.

Can I get a free sample?

Yes. Dabund can provide qualified customers with 3 pieces of free samples. Express cost may need to be covered by the buyer. You can request samples through the free sample page.

Can I print my logo on the insulation?

Yes. Dabund supports OEM and ODM customization, including logo printing, size marking, length marking and custom packaging.

What payment terms are available?

Payment terms may include T/T, L/C at sight, credit card and other agreed payment methods depending on order details.

What delivery terms can you offer?

Dabund can offer common international trade terms such as EXW, FOB, CFR and CIF.

How long is your delivery time?

Normal delivery time is usually 15 to 20 days. For urgent orders, production and shipment can be arranged in advance according to factory schedule.